Knife sheath



FIG. 1 is a front elevational view of a knife sheath showing my new design;

FIG. 2 is a rear elevational view thereof; and

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view of a knife sheath showing my new design; and,

FIG. 8 is another perspective view thereof.

The broken lines in the figures are for the purposes of illustrating portions of the knife sheath, which form no part of the claimed design. 

CLAIM The ornamental design for a knife sheath, as shown and described. 